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Don't know how heavy the 373RD or the 3791RD are but we have pulled a 38' Montana with an F250 with 7.3L Diesel for years. No Gasser would have ever been able to do and we have a 3.7 rear end. Average mileage while pulling on a 1600 mile trip was in the 12 to 13 mpg region. Including mountain passes and 600 miles of flat. I'm not up to date on the new big gas engines but I sincerely doubt they would provide the torgue and pulling power for mountain passes. Compare the torque values. Disel has occasionally been lower priced than gas recently. A diesel engine will probably go for 400,000 miles. Gas maybe 200,000. Now have 200,000 miles on ours and runs great with really good power. The front end needs some work but not the engine or drive train. Diesel may cost more up front but pays it all back later.
If I were to buy again for our load it would be a F350 Diesel SRW
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